My pet recently passed and I have s huge bag of mostly unused toys and pet shirts can I donate them here?

Yes, you can donate them. The shelter will take anything they can use and offer the rest to the public.

Yes, or you can find private foster care givers or private adoption people.. they would really benefit as they are very small and care for our unwanted and/or abandoned animals.

I believe so, I would call them and make sure. You can also call other shelters.